The following is a mind map about the sourness and sweetness of strawberries: strawberries are sour and sweet: strawberries are a kind of fruit, which has both sourness and sweetness. Reason: < br > 1, sour taste: Strawberries contain organic acids such as citric acid and malic acid, which give strawberries a unique sour taste. Sweetness: Strawberries also contain natural simple sugars such as fructose and glucose, which bring the sweetness of strawberries.

2. Variety: Different varieties of strawberries are different in sour and sweet taste, some varieties are more sour, while others are sweeter.

3. Maturity: The maturity of strawberry will also affect its sweet and sour taste. Less mature strawberries are more sour, while fully mature strawberries are sweeter.

4. Growing environment: Factors such as soil, climate and season in strawberry growing environment will also affect its sour and sweet taste. For example, a growing environment with abundant sunshine and suitable temperature will make strawberries sweeter.

5, use: sour strawberries can be used to make yogurt, jam and other foods, used to increase the level of taste and seasoning. Sweet strawberries can be eaten directly or used to make desserts, fruit salads and so on, bringing a pleasant taste experience.

6. Summary: Strawberries are sour and sweet because they contain organic acids such as citric acid and simple sugars such as fructose. Variety, maturity and growth environment affect the sweet and sour taste of strawberries. Strawberry can be used in different cooking and eating occasions according to its sweet and sour characteristics.